Ms Le Pen, whose aunt led the Front National in the 2016 French elections, told an audience of of US right-wingers at the Conservative Political Action Conference that France “wants our country back”.
The 28-year-old inspired a chorus of boos as she mentioned the EU and told the audience the election of Donald Trump and Brexit can be used as inspiration to put “France first” and secure a Frexit referendum.
She claimed the French youth is right-leaning and believes in national identity, something the EU has taken away from them.
Ms Le Pen accused the EU of “slowly killing” nation states and warned about the impact of “political correctness”, proclaiming “France is no longer free.”
The 28-year-old right-winger said: “Never underestimate the people.
“Brexit in the UK and, of course, the election of the President donald Trump proved a fact, when the people are given the opportunity to take their country back, they will seize it.
“Through your actions and your talent, you have succeeded in putting conservatism right back on top of the political agenda.
“Let us build on what you have achieved here, so that on both sides of the Atlantic a conservative agenda may prevail.”
In her 10-minute speech she flattered the crowd with her desire to launch a Trump-inspired campaign in France.
“Just like you, we want our country back,” she said.
“I came here to tell you that there is a youth ready for this fight in Europe today.
“A youth who believes in hard work, who believe the flag means something, who want to preserve individual freedom and private property.”
Ms Le Pen’s presence at CPAC prompted some criticism from the American right wing, former Fox News host Glenn Beck suggested she was a “national socialist”.
However, Matt Schlapp, the head of the American Conservative Union, said Ms Le Pen is a “classical liberal”, unlike her aunt and others in the Front National.